Operation
Calibration Factors Menu
Thermo Fisher Scientific
Model 15
i
Instruction Manual
3-17
In the following example, the analyzer displays 15.80 ppm of HCl while
sampling zero air. The HCl background correction is 0.0 ppm. That is, the
analyzer is not applying a zero background correction. The question mark
is used to indicate that the background value has been changed. In this case
the background correction must be increased to 15.80 ppm in order for the
HCl reading to be at 0 ppm.
To set the HCl reading in the following example to zero, use
to
increment the HCl background correction to 15.80 ppm. As the HCl
background correction is increased, the HCl concentration is decreased.
Note that at this point, pressing
and
have no effect on the
analog outputs or the stored HCl background correction of 0.0 ppm. A
question mark following the HCl background correction indicates that
these are proposed changes as opposed to implemented changes. To escape
this screen without saving any changes, press
to return to the
Calibration Factors menu or
to return to the Run screen. Press
to actually set the HCl reading to 0 ppm and store the new
background correction of 15.80 ppm. Then the question mark prompt
beside the HCl reading disappears.
●
In the Main Menu, choose Calibration Factors
>
Bkg
.
HCl BACKGROUND:
HCl: 15.80
SET BKG TO: 0.00 ?
©ª
INC/DEC
SAVE VALUE
RANGE AVG DIAGS ALARM
The span coefficient is usually calculated by the instrument processor
during calibration. The span coefficients are used to correct the HCl
readings and normally have a value near 1.000.
The Coefficient screen allows the HCl span coefficient to be manually
changed while sampling span gas of known concentration.
The display shows the current HCl concentration reading. The next line of
the display shows the HCl span coefficient that is stored in memory and is
being used to correct the HCl concentration. Notice that as the span
coefficient value is changed, the current HCl concentration reading on the
above line also changes. However, no actual changes are made to the value
stored in memory until
is pressed. Only proposed changes, as
indicated by a question mark prompt, are displayed until
is pressed.
HCl Coefficient
